actions/checkout implements sparse-checkout with --filter=blob:none, so
the runner repo is a partial clone missing the .repos/ blobs. eas-cli
archives the project via `git clone --depth 1 file://<workspace>`,
which upload-pack cannot serve from a partial clone and exits 128
(#4802 broke both EAS build workflows this way).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>